crazy that may seem ♪ >> reporter: dave nellis plays solo on the stage as city crews pick up the final peieces of th music in the park concert perhaps for good. >> we're going to look at all of our options and make a decision in the fall. >> reporter: a decision that could force the san jose downtown association to cancel the summer concert series. and this is why -- this is video i shot on my iphone thursday of police arresting a man after a fight. then there's this youtube video of more fight downtown. some business owners say they've had enough -- >> lot of fights, lot of gangs. >> reporter: including this woman who didn't want to be identified. >> what it does, it takes away the family feeling here, and you is to take your kids out because you don't want them to see all that mess. ♪ >> reporter: even though nellis is playing to a much smaller crowd today, he still feels the concerts must go on. >> the people that work hard all week and want to come out thursday and have a great time, you know, can't punish them. >> reporter: the association is hearing it from both sides. business owners